<p style="font-size:12px;">
This sample demonstrates how jqGrid works with large amount of data.<br>
We have put into a table in a Mysql database about 12.000 records filled with random words. jqGrid, using Ajax, loads only those records, that are visible.<br>
If you want to make a search (just enter some word into input fields), grid sends search criteria to server and loads only data that correspond to entered criteria.<br>
Speed is increased about 2 times if we index the column. In this case this is column Code<br>
<i>Important: sample is working with real data - <b>12.000</b> records! Enjoy it's performance</i>
<br />
<div class="h">Search By:</div>
<div>
	Code<br />
	<input type="text" id="search_cd" onkeydown="doSearch(arguments[0]||event)" />
	<input type="checkbox" id="autosearch" onclick="enableAutosubmit(this.checked)"> Enable Autosearch <br/>
</div>
<div>
	Name<br>
	<input type="text" id="item_nm" onkeydown="doSearch(arguments[0]||event)" />
	<button onclick="gridReload()" id="submitButton" style="margin-left:30px;">Search</button>
</div>

<br />
<table id="bigset" class="scroll" cellpadding="0" cellspacing="0"></table>
<div id="pagerb" class="scroll" style="text-align:center;"></div>
<script src="bigset.js" type="text/javascript"> </script>
<br />
<div style="font-size:12px;">
<b> HTML </b>
<XMP>
...
<div class="h">Search By:</div>
<div>
	<input type="checkbox" id="autosearch" onclick="enableAutosubmit(this.checked)"> Enable Autosearch <br/>
	Code<br />
	<input type="text" id="search_cd" onkeydown="doSearch(arguments[0]||event)" />
</div>
<div>
	Name<br>
	<input type="text" id="item" onkeydown="doSearch(arguments[0]||event)" />
	<button onclick="gridReload()" id="submitButton" style="margin-left:30px;">Search</button>
</div>

<br />
<table id="bigset" class="scroll" cellpadding="0" cellspacing="0"></table>
<div id="pagerb" class="scroll" style="text-align:center;"></div>
<script src="bigset.js" type="text/javascript"> </script>
</XMP>    
<b>Java Scrpt code</b>
<XMP>
jQuery("#bigset").jqGrid({        
   	url:'bigset.php',
	datatype: "json",
	height: 255,
   	colNames:['Index','Name', 'Code'],
   	colModel:[
   		{name:'item_id',index:'item_id', width:65},
   		{name:'item',index:'item', width:150},
   		{name:'item_cd',index:'item_cd', width:100}
   	],
   	rowNum:12,
//   	rowList:[10,20,30],
   	imgpath: gridimgpath,
   	mtype: "POST",
   	pager: jQuery('#pagerb'),
   	sortname: 'item_id',
    viewrecords: true,
    sortorder: "asc"
});
var timeoutHnd;
var flAuto = false;

function doSearch(ev){
	if(!flAuto)
		return;
//	var elem = ev.target||ev.srcElement;
	if(timeoutHnd)
		clearTimeout(timeoutHnd)
	timeoutHnd = setTimeout(gridReload,500)
}

function gridReload(){
	var nm_mask = jQuery("#item_nm").val();
	var cd_mask = jQuery("#search_cd").val();
	jQuery("#bigset").setGridParam({url:"bigset.php?nm_mask="+nm_mask+"&cd_mask="+cd_mask,page:1}).trigger("reloadGrid");
}
function enableAutosubmit(state){
	flAuto = state;
	jQuery("#submitButton").attr("disabled",state);
}
</XMP>
<b>PHP with MySQL (bigset.php)</b>
<XMP>
<?php
ini_set('max_execution_time', 600);
include("dbconfig.php");
// coment the above lines if php 5
include("JSON.php");
$json = new Services_JSON();
// end comment
$examp = $_GET["q"]; //query number

$page = $_GET['page']; // get the requested page
$limit = $_GET['rows']; // get how many rows we want to have into the grid
$sidx = $_GET['sidx']; // get index row - i.e. user click to sort
$sord = $_GET['sord']; // get the direction
if(!$sidx) $sidx =1;


if(isset($_GET["nm_mask"]))
	$nm_mask = $_GET['nm_mask'];
else
	$nm_mask = "";
if(isset($_GET["cd_mask"]))
	$cd_mask = $_GET['cd_mask'];
else
	$cd_mask = "";
//construct where clause
$where = "WHERE 1=1";
if($nm_mask!='')
	$where.= " AND item LIKE '$nm_mask%'";
if($cd_mask!='')
	$where.= " AND item_cd LIKE '$cd_mask%'";

// connect to the database
$db = mysql_pconnect($dbhost, $dbuser, $dbpassword)
or die("Connection Error: " . mysql_error());

mysql_select_db($database) or die("Error conecting to db.");

$result = mysql_query("SELECT COUNT(*) AS count FROM items ".$where);
$row = mysql_fetch_array($result,MYSQL_ASSOC);
$count = $row['count'];

if( $count >0 ) {
	$total_pages = ceil($count/$limit);
} else {
	$total_pages = 0;
}
if ($page > $total_pages) $page=$total_pages;
if ($limit<0) $limit = 0;
$start = $limit*$page - $limit; // do not put $limit*($page - 1)
if ($start<0) $start = 0;
$SQL = "SELECT item_id, item, item_cd FROM items ".$where." ORDER BY $sidx $sord LIMIT $start , $limit";
$result = mysql_query( $SQL ) or die("Couldnt execute query.".mysql_error());
$responce->page = $page;
$responce->total = $total_pages;
$responce->records = $count;
$i=0;
while($row = mysql_fetch_array($result,MYSQL_ASSOC)) {
	$responce->rows[$i]['id']=$row[item_id];
    $responce->rows[$i]['cell']=array($row[item_id],$row[item],$row[item_cd]);
    $i++;
} 
echo $json->encode($responce); // coment if php 5
//echo json_encode($responce);
mysql_close($db);
?>
</XMP>
</div>